#define _CRT_SECURE_NO_WARNINGS 1


#include<stdio.h>

int main()
{
	int a = 0;
	int b = 0;
	int c = 0;
	scanf("%d %d %d", &a, &b, &c);
	if (a + b > c && a + c > b && b + c > a)
	{
		if (a == b && b == c)
		{
			printf("Equilateral triangle\n");
		}
		else if (a == b || a == c || b == c)
		{
			printf("Isosceles triangle\n");
		}
		else
		{
			printf("Scalene triangle\n");
		}
	}
	else
	{
		printf("Not a triangle\n");
	}
	return 0;
}